Applying various hash methods used in conjunction with a query with a group by clause
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United States of America Patent
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Jan 31, 2012
Grant Date -
Oct 1, 2009
app pub date -
Mar 28, 2008
filing date -
Mar 28, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A novel method is described for applying various hash methods used in conjunction with a query with a Group By clause. A plurality of drawers are identified, wherein each of the drawers is made up of a collection of cells from a single partition of a Group By column and each of the drawers being defined for a specific query. A separate hash table is independently computed for each of the drawers and a hashing scheme (picked from among a plurality of hashing schemes) is independently applied for each of the drawers.
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